It's probably specific to the individual Thai Embassy or Thai Consulate that the Thai E–Visa Application was submitted to, but, each Request for Additional Documents directly from the Thai Embassy/Thai Consulate "resets" the Processing Time clock
so, for the Thai Consulate in Los Angeles, processing time is 15 business days, so, expect that after their Request for Additional Documents, the window to receive that Document Request will probably stay open for 15 business days
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